Hong Kong leader Carrie Lam took to the airwaves on Saturday to back the use of force by police ahead of a major anti-government march planned this weekend in the Chinese-ruled city, which has been battered by months of violent protests. Following a week of relative calm, Sunday’s march will test the strength of the pro-democracy movement. The trigger for unrest in Hong Kong had been a now-withdrawn proposal to allow extradition to mainland China, as well as Taiwan and Macau.